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BC548

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Changjiang Electronics Tech (CJ) Bipolar Transistors - BJT, TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componenttransistorsbc548factory-2.0.0extractor-text

Verified BC548

by Ray · last 5 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

5 Nov 2026RayPublished by the parts factory: tier lcsc, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: BC548 · TO-92 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 2-page datasheet
  • •distributor (warn): no ['digikey'] number
  • ✓family: TO-92_Inline
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-izo1uy4k/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓symbol_text: no pin names collide
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ bc548.kicad_sym✓ bc548.kicad_mod✓ bc548.step
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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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BC548

Changjiang Electronics Tech (CJ) · Bipolar Transistors - BJT · TO-92

BC548 from Changjiang Electronics Tech (CJ), in a TO-92. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 COLLECTOR passive Collector of the NPN transistor; for BC548 the datasheet gives VCBO 30 V, VCEO 30 V, and continuous collector current IC 0.1 A, with collector power dissipation PC 625 mW.
2 BASE input Base of the NPN transistor; the datasheet lists the BC548 emitter-base voltage VEBO as 5 V and gives VBE(sat) 1.1 V at IC=100 mA, IB=5 mA.
3 EMITTER passive Emitter of the NPN transistor; the datasheet lists the BC548 emitter-base voltage VEBO as 5 V (the emitter-base breakdown voltage V(BR)EBO minimum is 5 V at IE=10 μA).

Key specifications

Parameter Value
Manufacturer Changjiang Electronics Tech (CJ)
Package TO-92
Category Transistors
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Collector-base voltage (BC548) VCBO 30 V Ta=25℃ 1
Collector-emitter voltage (BC548) VCEO 30 V Ta=25℃ 1
Emitter-base voltage (BC548) VEBO 5 V Ta=25℃ 1
Collector current-continuous IC 0.1 A Ta=25℃ 1
Collector power dissipation PC 625 mW Ta=25℃ 1
Junction temperature Tj 150 ℃ 1
Storage temperature Tstg -55 150 ℃ 1
Thermal resistance junction to ambient RθJA 200 ℃/W 1
Collector-base breakdown voltage (BC548) V(BR)CBO 30 V IC= 0.1mA,IE=0 2
Collector-emitter breakdown voltage (BC548) V(BR)CEO 30 V IC=1mA,IB=0 2
Emitter-base breakdown voltage (BC548) V(BR)EBO 5 V IE=10μA,IC=0 2
Collector cut-off current (BC548) ICBO 0.1 μA VCB=30V,IE=0 2
Emitter cut-off current IEBO 0.1 μA VEB=5V,IC=0 2
DC current gain hFE 110 800 VCE=5V, IC=2mA 2
Collector-emitter saturation voltage VCE(sat) 0.3 V IC=100mA,IB=5mA 2
Base-emitter saturation voltage VBE(sat) 1.1 V IC=100mA,IB=5mA 2
Base-emitter voltage VBE 0.58 0.7 V VCE=5V, IC=2mA 2
Base-emitter voltage VBE 0.75 V VCE=5V, IC=10mA 2
Collector output capacitance Cob 4.5 pF VCB=10V,IE=0, f=1MHz 2
Transition frequency fT 150 MH VCE=5V,IC=10mA, f=100MHz 2

CAD (KiCad official)

  • Symbol: BC548
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: bc548-etched.step / bc548-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc548.step / bc548.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Changjiang Electronics Tech (CJ) datasheet (2 pp, sha256 068ebd7ca4658019, retrieved 2026-11-05, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF